Contour machining method and apparatus for printed circuit board

Details Contour machining method and apparatus for printed circuit board Contour machining method and apparatus for printed circuit board

1989-12-06

1991-04-30

Howell, Daniel W.

Gear cutting, milling, or planing

Milling

Process

36447412, 36447417, 409 84, 409134, B23C 100

Patent

active

050113453

ABSTRACT:
A method of machining the contour of a printed circuit board by effecting a relative feed movement between a rotating tool and the other periphery of the printed circuit board. The electrical current value of a drive motor for driving a spindle to which the tool is attached is detected and an operation is conducted for changing the machining condition in such a manner as to reduce the electrical current value of the spindle drive motor and, at the same time, for changing also tool diameter compensation amount to a value corresponding to the machining condition after the change, at every time the detected electrical current value has reached a predetermined current value immediately before tool breakage and repeatedly by a predetermined number of times.

REFERENCES:
patent: 3259023 (1966-07-01), Rieger et al.
patent: 3545310 (1970-12-01), Porath et al.
patent: 4208718 (1980-06-01), Chung
patent: 4351029 (1982-08-01), Maxey et al.
patent: 4786220 (1988-11-01), Fildes et al.

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